Attribute level_up to Alex
Install level_up from /src using setup.py
Add Python 3 and Tcl/Tk to Dependencies.md
Update testing matters in test/level_up/Readme
Save level_up scores file in RED_SPIDER_ROOT > work > level_up
Merge pull request #1 from jgonggrijp/level_up-roundup

Level_up roundup for the first integration pull request